Webster's English Dictionary

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hairline

hair.line \-.li-n\ n 1: a very slender line : as  1a: a tiny line or crack 
   on a surface  1b: a fine line connecting thicker strokes in a printed 
   letter  2a: a textile design consisting of lengthwise or crosswise lines 
   usu. one t hread wide 2b: a fabric with such a design  3: the outline of 
   the scalp or of the hair on the head  - hairline aj